Tight gas fracturing productivity calculation model based on gas-water permeability curve

Measuring well production per well can not only simplify the process flow, improve economic efficiency, but also reduce the development cost of the oil field. In this paper, a single-well measurement of oil well production is carried out by establishing a capacity calculation model for fracturing straight wells in tight gas reservoirs by means of gas-water phase infiltration curve. According to different permeability and porosity, several representative relative permeability curves are selected for normalization treatment, and then the angle-preserving transformation principle is used, considering the formation stress sensitivity effect and gas slip effect, as well as the stress sensitivity effect in the fracture and the effect of high-speed non-Daxi effect on gas seepage, the quasi-pressure function is introduced, and the capacity calculation model of the fracturing straight well of the tight gas reservoir is established, so as to achieve the calculation of the yield.